Respuesta :

Answer:

15

Step-by-step explanation:

A number squared is n² and 3 added to it is n² + 3, thus

n² + 3 = 228 ( subtract 3 from both sides )

n² = 225 ( take the square root of both sides )

n = [tex]\sqrt{225}[/tex] = 15

The required number is 15